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| | J-series™ Services Router Basic LAN and WAN Access Configuration Guide |
 | | D4 framing requires the 8th bit of every byte (of every channel) within the frame to be set to 1, a process known as bit robbing. |
 | | The framing bits from frames 2, 6, 10, 14, 18, and 22 are used to pass a CRC code for each superframe block. |
 | | The framing bits for frames 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, and 23 are used for the data link channel. |
| www.juniper.net /techpubs/software/jseries/junos75/jseries75-config-guide-basic/jN143C3.html (408 words) |
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